Life cycle assessment of biochar from two-step torrefaction and pyrolysis of microalgal biomass
This study explored the sustainable production of microalgal biochar for graphite applications through a life cycle assessment (LCA) of 12 scenarios varying in CO2 source, pre-treatment methods, and pyrolysis temperature. Biomass subjected to two-step torrefaction and pyrolysis at 700°C has the high...
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| Format: | text |
| Language: | English |
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Animo Repository
2024
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| Online Access: | https://animorepository.dlsu.edu.ph/etdm_mecheng/16 https://animorepository.dlsu.edu.ph/context/etdm_mecheng/article/1025/viewcontent/Final_Thesis_KO__08_03_24_.pdf |
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| Institution: | De La Salle University |
| Language: | English |
| Summary: | This study explored the sustainable production of microalgal biochar for graphite applications through a life cycle assessment (LCA) of 12 scenarios varying in CO2 source, pre-treatment methods, and pyrolysis temperature. Biomass subjected to two-step torrefaction and pyrolysis at 700°C has the highest carbon content (62.50 wt%), followed by 600°C (62.155 wt%), crucial for graphite application. Scenarios utilizing CO2 from flue gas exhibited net negative greenhouse gas (GHG) emissions (-155 to -263 kg CO2-eq), with pyrolysis as the hotspot. Conversely, scenarios using CO2 from gas tanks resulted in positive GHG emissions (600-708 kg CO2-eq), with cultivation as the hotspot. Scenario i, employing flue gas CO2 and the two-step process, emerged as the most environmentally favorable (-256.165 kg CO2-eq) with desirable biochar properties. Future research should explore carbon capture technologies, renewable energy integration, techno-economic analyses, process scale-up, and expanded system boundaries to develop a comprehensive and sustainable microalgal biochar production process. |
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